Thank you for the answer Carlos!
I've tried both before i've posted here.
With "Simulation Rate" at "fastest" clouds are moving a bit faster, but not this fast.
I am sure that it was made with "Time Preview" because when i saw this trailer (shortly after release) i've tried to recreate the effect and it worked.
I believe there is something to do with clouds type, layer altitude, maybe also wind speeds... But whatever I try, it doesn't work now unfortunately. I totally forgot what i have did then.